Mag-Dolomite (Magnesite-Dolomite)

Mag-dolomite is a mineral consisting of a mixture of magnesite (MgCO₃) and dolomite (CaMg(CO₃)₂). The ratio of these two minerals in mag-dolomite can vary, influencing its properties and applications.

The precise chemical composition of mag-dolomite depends on its source but generally includes significant amounts of magnesium carbonate (MgCO₃) and calcium magnesium carbonate (CaMg(CO₃)₂). In addition to these two, minor amounts of other minerals such as silica, iron oxide, and alumina may also be present. Mag-dolomite is extracted from mines. After extraction, the ore is crushed and ground, then processed through various methods, such as calcination (roasting). Calcination removes carbon dioxide, forming magnesium oxide (MgO) and calcium oxide (CaO). This process affects the properties of mag-dolomite, making it suitable for various applications. The high magnesium percentage contributes to resistance against hydration, abrasion, corrosion, and high thermal shock resistance.

The company, Azar Speed Sepahan, leverages a two-stage calcination process, heating the magnesite-dolomite to temperatures exceeding 1300°C to produce mag-dolomite. The ready access to high-quality dolomite in Isfahan, a region rich in dolomite deposits, including the company's ownership of one of the largest and highest-quality dolomite mines in the country (Kimia Gostar Shahreza), provides a significant advantage.

This material is used in various industrial applications due to its unique chemical and physical properties.

The properties of mag-dolomite depend on the ratio of magnesite and dolomite in it, as well as its purity. In general, mag-dolomite has the following properties:

• Thermal Resistance: Mag-dolomite exhibits relatively good thermal resistance, but less than pure magnesite.
• Chemical Resistance: It is resistant to many chemicals but is susceptible to acids.
• Density: It has a moderate density.
• Hardness: It has moderate hardness.
• Color: It is typically light gray to light brown.

Chemical  analysis  Chamotte  Product

Mag-Dolomite Applications:

• Refractory Industry: As a raw material in the production of refractory bricks, refractory mortars, and other refractory products used in high-temperature industrial furnaces.
• Agriculture: As a fertilizer and soil amendment due to its magnesium and calcium content.
• Steel Industry: In steel production processes, as a fluxing agent and refining agent.
• Cement Industry: As an additive in cement production.
• Chemical Industry: In the production of certain chemicals.

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Mag-Dolomite analysis